While there are conflicting versions of events, the AP reports that an al-Qaeda linked group active in the Sinai Peninsula–Ansar Jerusalem–has claimed its fighters were targeted in a drone strike inside of Egyptian territory. Four were reported dead.
Israel has maintained official silence about the strike, suggesting that if the Jewish state was involved, it might be trying to avoid embarrassing the Egyptian military. An Egyptian military spokesman later denied the report but did not provide another cause for the explosion.
The strike could signal a significant new level of security cooperation between Egypt and Israel following the military coup that ousted Egypt’s president, Mohammed Morsi, last month. The military has alleged that Morsi and his Muslim Brotherhood movement had turned a blind eye to Islamic militants in the Sinai.